| Summary: | This special issue of Oceanography takes a look at a variety of undersea natural hazards—hazards resulting from natural processes such as earthquakes, tsunamis, volcanic eruptions, and landslides. These undersea natural hazards are generally more difficult to assess than those on land because of the challenges and expense of working in the ocean. Seafloor monitoring networks, deep drilling of fault zones, new computational methods, high-resolution sonar imaging, and paleoseismology, among other technologies and strategies, are all shedding new light on hazard risk and assessment around the globe.
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